One grave belonged to Prophet Jonah, revered by Muslims and Christians

Rebels believe special veneration of tombs is against teachings of Islam

Comes as more than 50 bodies have been found in city south of Baghdad

Most of the bodies were blindfolded with gunshot wounds, said authorities

Investigation is underway to establish the circumstances of the killings

This is the shocking moment ISIS militants took sledgehammers to Iraqi tombstones - smashing them to pieces.
The rebels, who are members of the Islamic State terror group, were
filmed attacking centuries-old graves in the north-west city of Mosul in
Ninevah province.